Coolant device for tools



J 1952 4 E. K. ALLEN, JR 8 7 COOLANT DEVICE FOR TOOLS Original Filed May 9, 1947 Hg. 1 L26 IN V EN TOR.

Eowgpo K.- ALLEN JR.

Patented Jan. 15, 1952 COOLANT DEVICE FOR TOOLS Edward K. Allen, Jr., Worcester, Mass., assignor to Leland-Gifford Company, Worcester, Mass., a corporation of Massachusetts Original application May 9, 1947, Serial No.

747,052, now Patent No. 2,491,635, dated December 20, 1949. Divided and this application August 4, 1949, Serial No. 108,623

This invention relates to coolant devices for directing lubricants and coolants to tools and also to the work the tool is operating upon.

The principal object of the invention is to provide a device of the class described comprising a new and improved tool bushing which may be made in standard sizes for replacement and interchangeability, said bushing including means for providing correct placement of the coolant relative to the tool and to the work, and also into the groove, hole, etc., that is being machined, so as to flush out and break chips to prevent interference with the tool, and at the same time eliminating bulky and interfering coolant pipes and also to generally improve lubrication and coolant devices for various types of tools, thus reducing tool wear and increasing cutting efliciency. I

Further objects of the invention include the provision of new and improved tool bushings and liners which incorporate .therein coolant pas.- sages formed in the'bu'shin'gs and liners'in such a manner that the bushings can be located in the liners without regard to rotative positioning thereof and to at all times receive the coolant supply uniformly without the necessity of piping to achieve the desired result; and the provision of a novel guide bushing for tools in which bushing there are provided passages for directing coolants and lubricants to the tool in a direction in general the same as the direction of the tool feed, so that the tool is maintained clean and free from chips; and the coolant, at the same time, is directed to the hole which is being machined out by the tool so as to flush the same and clean out and break the chips.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings, in which:

Fig. 1 is a vertical sectional view through a work clamping device in which the present invention may be used, and illustrating the con struction and operation thereof;

Fig. 2 is an enlarged vertical section through abushing and liner embodying the present invention;

Fig. 3 is a bottom plan view of the bushing and liner shown in Fig. 2; and

Fig. 4 is a view in elevation of the bushing.

In order to efficiently cool and lubricate cutting tools it has been necessary in the prior art to provide cumbersome and bulky pipes to direct the coolant fluids to the places desired and it is often a difficult matter to design suchpiping so that it will not interfere with the operation of 1 Claim. (01. 7762) the machine. The present case is directed'to a new and improved coolant and lubrication system for cutting tools which obviates the use of pipes and also improves the cooling and lubrica tion-thereof.

As shown in Fig. 1, there is provided a base Iii which may be secured to a machine bed by any convenient means. The base [0 in the present case is provided with a generally vertically-arranged standard l2 having a vertically movable rack I4 therein, said rack. being operated by means of a gear [6 oscillated by a handle H3.

The rack I4 is secured at its top to a clamping head or support 20 which moves up and down therewith- Said head or support is provided with a'tool guiding bushing 22 which is in turn located in a liner 24 in a hole in the clamping head 20. The liner and the bushing are of course replaceable and interchangeable for different sizes oftools as forinstance the drill bit26 illustrated herein.

The work-piece is indicated at 'W and is clamped between base In and clamping head 2i) by means of an element 28 which may be integral with liner 24. However, this element need not be integral with the liner but may be mountedin any way desired, and in Fig. 2 the liner is shown by itself and without the clamping element 28.

In any case, however, the element 28 is provided with a hole 30 for receiving and directing coolant and lubricating fluids and is also provided with a conical surface 32 to aid in centering the work W, the surface 32 intersecting a side wall or hole 30 so as to allow the work to receive the coolant.

The base H] is provided with a coolant inlet 34 which leads to a vertical hole 36 aligned with a similar hole 38 in the head 20. A valve 40 is arranged in the two holes, being secured to the head and slidable in the hole 36. provided with an opening 42 communicating with a passage 44 therein, passage 44 in turn communicating with a passage 46 in head 20 so that when the valve is open, coolant fluids flow from the inlet 34 through the valve 40 into passage 46 and into the liner and bushing to the tool as will be hereinafter more fully described.

It will be understood that as the head 20 is brought down by means of rack l4 under influence of the handle 18, the passage 42 will become aligned with inlet 34 so that the valve is open, but when the clamping head is up, the passage 42 is closed in the hole 36 and the fluid will now flow. Also, when the clamping head comes down, it clamps the work in a well known The valve is in Figs. 2 to 4 and it will be seen that the liner 24 actually is a simple sleeve or hollowcylinder which has a flange at 50 to position the same in the hole in the clamping head '20, and-it is' also provided with a through hole or aperture in the side wall as at 52, this hole or aperture aligning with passage 46.

The bushing is provided with a flange St to position the same on the line]: and it alsohas an. annular groove 56 extending all the way :around:

it in position'to be aligned with hole or aper ture 52, and therefore passage 46, to receive the coolant fluids.

The-annular" groove 56 is'provided with a conical wall at 58 and a plurality of converging annularpassages 60' are formed leading down from said conical surface'of the bushing. These passages 50 are at such an angle as to direct coolant to the tool 26' and into the flutes thereof "so as to perform the desired function of cooling and lubricating the tool and also cleaning the same of chips.

It will be seen that this invention provides tool liners and bushings which may be made standard, releasable, and interchangeable, as is the practice at the present time, but with the additional advantage of optimum placement of coolant as respects both the tool and the hole being machined in the work, and in the absence of interfering and bulky pipes. The bushings of the presentinvention can be Iocatedin the liners without regardto rotational positioning, and the coolant supply will act as a chip breaker as well 4 as chip remover during the operation of the tool. Also, this invention provides a uniform supply of coolant so as to reduce tool wear and increase the cutting speed and general efi'iciency of the machine.

"This application is a division of my pending application 'Serial'No. 747,052, filed' May 9, 1947, and issued as U. S. Patent Number 2,491,635 December 20, 1949.

Having thus described my invention and the advantages thereof, I do not wish to be limited tothe details herein disclosed, otherwise than a'ssettforth in the claim, but what I claim is:

In a machine 'tool' comprising a head having a lubricant carrying passage, a tool guiding and lubricating :deviceon said head comprising a tool :guiding-bushing and a liner receiving said bushing, said liner' having a radial aperture through a wall thereof communicating with said lubricant carrying passage in said head, said bushing having anexterior annular groove aligned with said aperture in the liner and a series; of downwardly and inwardly 'directed' passages extending from said annular groove so'lelyto; the inner sur face of the bushing, at points spaced-from 'the lower end of the bushing, whereby the lubricant is ejected directly onto a tool insai'd bushing and is substantially confined between the bushing and the tool in saidbushing.

EDWARD K. JR.

REFERENCES CITED The following referencesv are of record in the file of this patent:

UNITED-STATES PATENTS Number Name Date 1,422,031 Caulkins July*4, l922 1,465,181 Briney Aug. 14, 1923 1,79I,532 Oberly et al Feb. 1'0, 1931 2,491,635 Allen, Jr. Dec. 20, 1949' 

